Vulnerability Description
Versions of the package jsrsasign before 11.1.1 are vulnerable to Improper Verification of Cryptographic Signature via the DSA domain-parameter validation in KJUR.crypto.DSA.setPublic (and the related DSA/X509 verification flow in src/dsa-2.0.js). An attacker can forge DSA signatures or X.509 certificates that X509.verifySignature() accepts by supplying malicious domain parameters such as g=1, y=1, and a fixed r=1, which make the verification equation true for any hash.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Jsrsasign Project | Jsrsasign | < 11.1.1 |
Related Weaknesses (CWE)
References
- https://gist.github.com/Kr0emer/bf15ddc097176e951659a24a8e9002a7ExploitMitigationThird Party Advisory
- https://github.com/kjur/jsrsasign/commit/37b4c06b145c7bfd6bc2a6df5d0a12c56b15ef6Patch
- https://github.com/kjur/jsrsasign/pull/646Issue Tracking
- https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15370940Third Party Advisory
- https://gist.github.com/Kr0emer/bf15ddc097176e951659a24a8e9002a7ExploitMitigationThird Party Advisory
FAQ
What is CVE-2026-4600?
CVE-2026-4600 is a vulnerability with a CVSS score of 7.4 (HIGH). Versions of the package jsrsasign before 11.1.1 are vulnerable to Improper Verification of Cryptographic Signature via the DSA domain-parameter validation in KJUR.crypto.DSA.setPublic (and the related...
How severe is CVE-2026-4600?
CVE-2026-4600 has been rated HIGH with a CVSS base score of 7.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-4600?
Check the references section above for vendor advisories and patch information. Affected products include: Jsrsasign Project Jsrsasign.